L-Theanine-120 capsules
L-Theanine-240 capsules
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  • 200mg of L-Theanine
  • An Amino Acid found in Green Tea
  • Made in the USA
  • Money Back Guarantee

Choose Your Size / Flavor

120 Capsules $0.11/serving 120 Servings
$12.30 $12.95
100g $0.04/serving 500 Servings
$18.95 $19.95
240 Capsules $0.10/serving 240 Servings
$21.80 $22.95

Nutricost’s 90-Day Money Back Guarantee

In the unlikely event that you’re not completely satisfied with ANY Nutricost™ product, we don’t want to keep your money. Even though our products are of the utmost quality, no supplement works for everyone. Contact us and we’ll refund 100% of your purchase price (minus S&H).


L-Theanine is an amino acid that is not common in the diet (not one of the essential amino acids or even one of the common nonessential amino acids), and is deemed a nondietary amino acid similar to L-Ornithine or L-Citrulline. L-Theanine has structural similarity to Glutamine.

L-Theanine is an amino acid that is typically found in teas (especially green teas), and unlike other amino acids, it is a nonprotein. While not an essential amino acid, it is primarily utilized for its sedative effects. Nutricost has brought you the benefits of green tea, without the tea, in the form of their top quality L-Theanine supplement that delivers 200 mg per serving.

L-Theanine is structurally very similar to GABA, a neurotransmitter responsible for calming nervous system activity and producing a relaxed feeling. However, taking GABA supplements is less effective, due to the fact that it cannot easily cross the blood-brain barrier. L-Theanine on the other hand passes through easily, and has a similar effect. This allows for stress relief and improvements in overall mood.

Anxiety and stress also have huge impacts on quality of sleep. L-Theanine has been found to help promote peaceful times of rest, by helping calm nervous system activity and stopping ruminating thoughts These persistent thoughts interfere with the regulation of beta waves, or electrical impulses in the mind which keep us feeling alert and awake all day. Alpha waves instead are necessary to induce sleep, which L-Theanine helps generate and regulate, to help you fall asleep easier and faster.

†*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.